Psalm 34:13

Keep thy tongue from evil, and thy lips from speaking guile.

Psalm 52:2

Thy tongue deviseth mischiefs; like a sharp razor, working deceitfully.

Psalm 141:3

Set a watch, O LORD, before my mouth; keep the door of my lips.

Proverbs 8:13
The fear of the LORD is to hate evil: pride, and arrogancy, and the evil way, and the froward mouth, do I hate.

Proverbs 10:19

In the multitude of words there wanteth not sin: but he that refraineth his lips [is] wise.

Proverbs 12:18

There is that speaketh like the piercings of a sword: but the tongue of the wise [is] health.

Proverbs 14.9 & 14.16

Fools make a mock at sin: but among the righteous there is favour.

A wise man feareth, and departeth from evil: but the fool rageth, and is confident.

Proverbs 15:1

A soft answer turneth away wrath: but grievous words stir up anger.

Proverbs 15:4

A wholesome tongue [is] a tree of life: but perverseness therein [is] a breach in the spirit.

Proverbs 17:28

Even a fool, when he holdeth his peace, is counted wise: [and] he that shutteth his lips [is esteemed] a man of understanding.

Proverbs 18:21

Death and life [are] in the power of the tongue: and they that love it shall eat the fruit thereof.

Proverbs 21:23

Whoso keepeth his mouth and his tongue keepeth his soul from troubles.

Matthew 12:33

Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by [his] fruit.

Ephesians 4:29

Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.

Titus 3:2

To speak evil of no man, to be no brawlers, [but] gentle, shewing all meekness unto all men.

James 1:26

If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man’s religion [is] vain.

James 3:2

For in many things we offend all. If any man offend not in word, the same [is] a perfect man, [and] able also to bridle the whole body.

1 Peter 3:10

For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile:

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Lying

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Exodus 20:16

Thou shalt not bear false witness against thy neighbour.

Psalm 101:7

He that worketh deceit shall not dwell within my house: he that telleth lies shall not tarry in my sight.

Proverbs 6.16-19

16 These six things doth the LORD hate: yea, seven are an abomination unto him:

17 A proud look, a lying tongue, and hands that shed innocent blood,

18 An heart that deviseth wicked imaginations, feet that be swift in running to mischief,

19 A false witness that speaketh lies, and he that soweth discord among brethren.

Proverbs 12:19

The lip of truth shall be established for ever: but a lying tongue [is] but for a moment.

Proverbs 12:22

Lying lips [are] abomination to the LORD: but they that deal truly [are] his delight.

Proverbs 19:5

A false witness shall not be unpunished, and [he that] speaketh lies shall not escape.

Proverbs 19:9

A false witness shall not be unpunished, and [he that] speaketh lies shall perish.

Proverbs 24:28

Be not a witness against thy neighbour without cause; and deceive [not] with thy lips.

Matthew 15:18-20

18 But those things which proceed out of the mouth come forth from the heart; and they defile the man.

19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:

20 These are the things which defile a man: but to eat with unwashen hands defileth not a man.

Luke 8:17

For nothing is secret, that shall not be made manifest; neither [any thing] hid, that shall not be known and come abroad.

John 8:44

Ye are of [your] father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.

Ephesians 4:25

Wherefore putting away lying, speak every man truth with his neighbour: for we are members one of another.

Colossians 3:9-10

9 Lie not one to another, seeing that ye have put off the old man with his deeds;

10 And have put on the new man, which is renewed in knowledge after the image of him that created him:

1 John 2:4

He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

Revelation 21:8

But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.

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Flattery

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Job 32:21

Let me not, I pray you, accept any man’s person, neither let me give flattering titles unto man.

Job 32:22

For I know not to give flattering titles; in so doing my maker would soon take me away.

Psalms 5:9

For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulchre; they flatter with their tongue.

Psalms 12:2

They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.

Psalms 12:3

The LORD shall cut off all flattering lips, and the tongue that speaketh proud things:

Psalms 36:2

For he flattereth himself in his own eyes, until his iniquity be found to be hateful.

Proverbs 6:24

To keep thee from the evil woman, from the flattery of the tongue of a strange woman.

Proverbs 26:28

A lying tongue hateth those that are afflicted by it; and a flattering mouth worketh ruin.